The rail car in front of the post office has intriqued me for sometime. So, I did a little searching around. Very interesting article I found.

https://en.wikipedia.org/wiki/Rail_transport_in_Panama

Ferrocarril de Chiriquí[edit]

At the end of the nineteenth century, the government of Panama studied the feasibility of additional railroads. In 1910, Panama Railway was commissioned to estimate cost of a railroad from Panama City to David, Chiriquí with branches to Antón (Coclé Province) and Los Santos. The costs were however too high and the government decided to construct additional network in Chiriquí Province only. In 1914, a contract was signed for construction of a railroad David - Boquete - Concepción with a branch Dolega - Potrerillos and another short one to Puerto Pedregal. The railroad was inaugurated on April 23, 1916 with the first train from David to Boquete. (Dr. Alonso Roy)

Edwards Rail Car company reports an undated acknowledgment of their three railcars, which were delivered to Ferrocarril de Chiriquí probably in the 1920s.

In the 1930s and 1940s, the railroads are mentioned in connection with Chiriquí Land Co., a United Fruit company, involved in banana growing and real estate management in Panama. The railroad used General Electric engines ([1]).
In Bocas del Toro Province, Chiriqui Land Co. also operated a railroad system that covered Almirante, Changuinola, Guabito and parts of Sixaola. This railroad was removed in 1999, leaving only the bridge over Changuinola River.

After 1974, the infrastructure of Chiriquí Railroads has been transferred to Ministry of Public Works (Ministerio de Obras Públicas) and operations were stopped. At the beginning of the twenty-first century, the tracks of the defunct railroads are being dismantled and reused for construction of bridges in rural areas La Prensa February 21, 2003.